Digital library containing some of the core printed primary and secondary sources for the medieval and modern history of the British Isles. Created by the Institute of Historical Research and the History of Parliament Trust. Historic Ordnance Survey maps in 1:10,560 scale for each county in England.

Organized by the counties of England, Scotland, and Wales, this site contains scanned images of historic Ordnance Survey maps dating from 1846 to 1899. Over 40,000 places are indexed alphabetically first by county and then by locality name.